Again - hard to disagree with you and also it remains unlikely that the PL will be played out and these FIFA proposed rules come into play but if they do, sure in terms of Ziyech & apologies if I'm missing anything, but wouldn't it be a relatively simple case of he is not registered to play this season. I get your point that chelsea are paying for a footballer they can't use; but ultimately when they signed him they signed him with a view to play next season. So in this case, can Chelsea come to an agreement with Ajax and the player to let him continue the season at Ajax beyond 1st July?
Regarding the fairness of the whole thing, agreed it is not fair but no outcome is, I think here we are only trying to discuss how it might work. Interesting choice of example with SUFC and Chelsea, I suspect Sheffield United would take their chances in this scenario rather than having the season voided when the are 5 points off CL football with a game in hand and the chance of what could be a step changing finish to the season simply being voided.
So you are proposing to a business in Chelsea, that an asset they have paid tens of millions for, knowing he was available to play in July, can't? If I am Chelsea (or Everton for that matter) I am seeking legal action for this as you have changed the rules part way through.
A better example may well be, what if you are a league 1 footballer, 23-4. You've bobbed around the lower leagues, earned maybe on average 1k p/w, not bad money but certainly not life changing. You're at 2k now, but a championship team is going to pay you 10k p/w over a 4 year period. There's a big sign on fee too of £250k. Essentially you can clear your mortgage and earn enough across that contract to be financially secure for the rest of your career.
Now the club you want to sign for, say that unless you are available to play, as per the contract from July 1st the offer will have to be withdrawn. What you are essentially advocating is a change in the laws that is going to infringe upon an employees right to practice their trade. As I say, good luck with that. You will be sued. I hope FIFA have deep pockets to be prepared to honour all of those contracts (and there will be plenty) that are lost.
The FIFA situation is not (as I see it) a change of rules. They have made a suggestion. The are covering themselves legally, so if/when UEFA/FA/PL say they can't do anything but void because of FIFA's controls-go after them, that is now off the table. You can understand most statements from the perspective of weasel behaviour trying to avoid being sued.
Unless FIFA are happy to underwrite the costs of contracts for players who aren't able to be used, wages for players who are to be kept at clubs, and the differential I'm wages for offer they have on the table (which will run into the hundreds of millions) then you may as well forget about extending the season. We can all make big statements. Someone is going to have to underwrite the costs.
From an Everton perspective that shouldn't be us. If a handful of teams want to continue the season, they can pick up the tab.